Size dependence of magnetization reversal of ring shaped magnetic tunnel junction

• Published in: Journal of magnetism and magnetic materials Vol. 310; no. 2; pp. 1900 - 1902
• Main Authors: Chen, C.C., Kuo, C.Y., Chang, Y.C., Chang, C.C., Horng, Lance, Wu, Teho, Chern, G., Huang, C.Y., Tsunoda, M., Takahashi, M., Wu, J.C.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01.03.2007; Elsevier Science
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Magnetic properties and materials; Magnetic tunnel junction rings; Magnetization revers; Physics; Size dependence; Magnetization revers; Size dependence; 85.70.Kh; 85.70.Ay; Magnetic tunnel junction rings; Magnetization reversal; Magnetization; Domain structure; 85.70.Kh; 85.70.Ay; Magnetic domains; Roughness; Tunnel junction; Magnetic tunnel junction rings; Size dependence; Magnetization revers; Magnetoresistance
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2006.10.686

The size dependence of magnetization reversal of magnetic tunnel junction (MTJ) rings has been investigated. The MTJ rings, with outer diameter of 4, 2 and 1 μm and inner diameter of 1.5, 1 and 0.5 μm were fabricated by a top–down technique. The magnetoresistance curves manifest all of the magnetic domain configurations during magnetization reversal in different sized rings. Various transition processes were observed, such as four transition, three transition and two transition in the largest, middle and smallest MTJ ring, respectively. Furthermore, the biasing fields observed from major loops decrease with decreasing size, which may result from edge roughness produced in the ion-milling process.